SoC–Based Inverter Control Strategy for Grid-Connected Battery Energy Storage in AC Microgrid

Abstract

The successful integration of battery energy storage systems (BESSs) is crucial for enhancing the resilience and performance of microgrids (MGs) and power systems. This study introduces a control strategy designed to optimize the operation of BESSs. This control strategy optimizes the BESS operation by dynamically adjusting the inverter’s power reference, thereby, extending the battery cycle life. This approach incorporates a droop control mechanism that adjusts control actions in response to state-of-charge (SoC) fluctuations of the BESSs, thereby, enhancing system performance. The effectiveness of this SoC–based control strategy is demonstrated through Matlab/Simulink. It shows its capabilities in regulating power, voltage, grid synchronization, and stability. The paper utilizes a modified CIGRE MG benchmark for system evaluation. It presents case studies to demonstrate the effectiveness of the proposed control modifications. Additionally, a comparative analysis with a power–voltage (P–V) control strategy is presented. This analysis highlights the advantages of the proposed strategy in ensuring stable voltage regulation within the MG. This research provides a robust foundation for future developments in optimizing BESS integration. It offers a roadmap to advance the efficiency, reliability, and longevity of battery-based solutions in the evolving landscape of sustainable energy systems. Additionally, it sheds light on the potential for scalability and applicability across diverse MG configurations and operational scenarios.